/Engine/Source/Runtime/Engine/Public/SkeletalMeshMerge.h
Create the 'MergedMesh' reference skeleton from the skeletons in the 'SrcMeshList'. Use when the reference skeleton is needed prior to finalizing the merged meshes (do not use withDoMerge()).
void MergeSkeleton ( const [TArray](API\Runtime\Core\Containers\TArray)< [FRefPoseOverride](API\Runtime\Engine\FRefPoseOverride) > * RefPoseOverrides )